Everything below concerns Mass spectrometry. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-09-30. Where a claim depends on a specific study, the study is described rather than over-claimed.
PPARδ is a nuclear receptor that influences transcription of genes involved in fatty acid oxidation, lipid transport, and energy homeostasis. GW501516 binds and activates this receptor with high selectivity relative to PPARα and PPARγ in laboratory assays. Activation alters expression of target genes in skeletal muscle, liver, and adipose tissue in animal models. The exact clinical consequences of these changes in humans remain incompletely characterized, and observed effects in animals do not establish therapeutic benefit or safety.
Published studies have examined GW501516 in animal models of obesity, insulin resistance, and exercise endurance. Early human trials reportedly ended, and development was discontinued after preclinical findings raised concerns about cancer in some rodent studies. Regulatory agencies have not approved cardarine for any medical use. Its availability through non-pharmaceutical channels raises questions about identity, purity, and legal status that are separate from its laboratory pharmacology. Those questions are often addressed through analytical testing rather than assumptions about product labels.
The compound is typically described as a laboratory compound rather than a therapeutic product. Published reports have explored its role in lipid disorders, insulin sensitivity, and exercise metabolism, yet no major drug regulator has approved it for medical use. Commercial samples sold under the cardarine name may vary in purity and identity. Analytical confirmation is therefore necessary when the material is discussed in scientific or regulatory contexts. Its classification as a prohibited substance in sport further shapes how it is studied and reported.
Cardarine is a common name for GW501516, a synthetic compound studied for its effects on lipid and glucose metabolism. It functions as an agonist at peroxisome proliferator-activated receptor delta, or PPARδ, a nuclear receptor that influences gene expression. The molecule is not a steroid, nor is it a selective androgen receptor modulator. It is also known in research and sports literature as GW-501516 and endurobol. Early laboratory work examined its metabolic activity in cell cultures and animal models.
| Property | Value | Notes |
|---|---|---|
| Chemical class | PPARδ agonist | Not an anabolic steroid. |
| Common synonyms | GW501516, GW-1516 | Cardarine is an informal name. |
| Appearance | White to off-white powder | Typical for research-grade solid. |
| Solubility class | Poorly soluble in water; soluble in some organic solvents | Such as DMSO or ethanol in laboratory settings. |
| Typical storage temperature | Cool, dry, protected from light | Specific conditions vary by supplier and form. |
Published human data are sparse and mostly come from early-phase trials. Those studies examined short-term changes in lipids, glucose, and exercise capacity, but they were not large enough to establish efficacy or long-term safety. Some animal experiments reported increased running endurance, yet such findings do not prove a performance benefit in people. Anti-doping laboratories detect GW501516 and its metabolites in urine or blood using liquid chromatography-tandem mass spectrometry. Detection windows depend on dose, sample type, and individual metabolism. The method is sensitive enough to identify trace residues in tested samples.
Laboratory handling focuses on identity, purity, and stability. Reference standards are typically stored cold and dry, protected from light, because solutions can degrade over time. Analytical checks may use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Impurities and related substances can be separated chromatographically and compared with a known standard. Because cardarine is not an approved drug, compendial monographs are absent, and laboratories often rely on in-house methods. Reported purity varies among unregulated products and should not be assumed from a label.
Laboratory detection of GW501516 commonly uses liquid chromatography coupled with tandem mass spectrometry. The method can identify the parent compound or its metabolites in urine and blood after sample cleanup. Protein precipitation, solid-phase extraction, or enzymatic hydrolysis may precede analysis, depending on the matrix. Reference standards are required for accurate quantification and confirmation. Because the compound is not approved, testing often occurs in anti-doping, forensic, or research settings rather than routine clinical care. Results are reported with limits of detection and quantification.
Stability of GW501516 depends on form, temperature, light exposure, and moisture. Solid reference material is typically stored frozen or refrigerated in a desiccator and protected from light. Solutions in organic solvents such as dimethyl sulfoxide are often kept frozen in aliquots to reduce freeze-thaw cycling. Aqueous solubility is low, so aqueous stock solutions can be difficult to prepare without cosolvents. Degradation may appear as changes in chromatographic purity or mass spectral signal. Stability studies are needed to establish shelf life for any specific preparation.
The pharmacological interest in cardarine centers on PPARδ activation and its downstream effects on lipid handling and mitochondrial function. In animal studies, PPARδ agonists have been associated with changes in exercise endurance and fatty acid utilization, though results vary by model and protocol. Human data remain sparse, and the absence of large controlled trials limits conclusions about efficacy. Researchers often describe the compound as a tool for probing PPARδ biology rather than a proven therapeutic agent.
Safety discussions about cardarine frequently cite rodent carcinogenicity findings reported in the 2000s. In those studies, treated animals developed tumors at multiple sites, leading sponsors to discontinue clinical development. The relevance of these findings to humans has not been resolved, but they are a major reason the compound is not approved. Current literature emphasizes uncertainty about long-term effects and the risks of unregulated use. Regulators and health agencies have not established a safe human exposure level.
Cardarine is a synthetic compound also known as GW501516, GW-501516, and sometimes endurobol. It was developed as a selective agonist of peroxisome proliferator-activated receptor delta, a nuclear receptor involved in fatty acid oxidation and energy metabolism. The compound was studied in preclinical models for metabolic and cardiovascular conditions, but it did not become a marketed human medicine. In regulatory and anti-doping contexts, it is treated as a prohibited substance rather than a licensed medicine.
A nuclear localization sequence, or signal (NLS) is an amino acid sequence motif that 'tags' a protein for import into the cell nucleus by nuclear transport. Typically, this signal consists of one or more short sequences of positively charged lysines or arginines exposed on the protein surface. Different nuclear localized proteins may share the same NLS. An NLS has the opposite function of a nuclear export signal (NES), which targets proteins out of the nucleus.
Analyzing proteins proves to be more difficult than analyzing nucleic acid sequences. While there are only 4 nucleotides that make up DNA, there are at least 20 different amino acids that can make up a protein. Additionally, there is currently no known high throughput technology to make copies of a single protein. Numerous methods are available to study proteins, sets of proteins, or the whole proteome. In fact, proteins are often studied indirectly, e.g. using computational methods and analyses of genomes. Only a few examples are given below.
==== Chronic obstructive pulmonary disease ==== Meta analysis has shown vitamin D supplementation did not influence the overall number of moderate or severe exacerbations of chronic obstructive pulmonary disease (COPD), but did reveal a protective effect in a subgroup with low vitamin D (baseline 25-hydroxyvitamin D levels <25 nmol/L).
Works by or about Carl Jung at the Internet Archive Works by Carl Jung at LibriVox (public domain audiobooks) Publications by and about Carl Jung in the catalogue Helveticat of the Swiss National Library C.G. Jung Institute, Zurich Museum House of C.G. Jung Küsnacht, Zurich (Switzerland) Carl Jung Resources The Jung Page Philemon Foundation Bollingen Foundation Collection From the Rare Book and Special Collections Division, Library of Congress The Journal of Analytical Psychology International Journal for Jungian Studies
Apicomplexans are a group of alveolates. Like the helicosproidia, they're parasitic, and have a nonphotosynthetic chloroplast. They were once thought to be related to the helicosproidia, but it is now known that the helicosproida are green algae rather than part of the CASH lineage. The apicomplexans include Plasmodium, the malaria parasite. Many apicomplexans keep a vestigial red algal derived chloroplast called an apicoplast, which they inherited from their ancestors. Apicoplasts have lost all photosynthetic function, and contain no photosynthetic pigments or true thylakoids. They are bounded by four membranes, but the membranes are not connected to the endoplasmic reticulum. Other apicomplexans like Cryptosporidium have lost the chloroplast completely. Apicomplexans store their energy in amylopectin granules that are located in their cytoplasm, even though they are nonphotosynthetic. The fact that apicomplexans still keep their nonphotosynthetic chloroplast around demonstrates how the chloroplast carries out important functions other than photosynthesis. Plant chloroplasts provide plant cells with many important things besides sugar, and apicoplasts are no different—they synthesize fatty acids, isopentenyl pyrophosphate, iron-sulfur clusters, and carry out part of the heme pathway. The most important apicoplast function is isopentenyl pyrophosphate synthesis—in fact, apicomplexans die when something interferes with this apicoplast function, and when apicomplexans are grown in an isopentenyl pyrophosphate-rich medium, they dump the organelle.
Sources: en.wikipedia.org
Such methods have been applied for discovering protein interactions on human interactome, specifically the interactome of Membrane proteins and the interactome of Schizophrenia-associated proteins. As of 2020, a model using residue cluster classes (RCCs), constructed from the 3DID and Negatome databases, resulted in 96-99% correctly classified instances of protein–protein interactions. RCCs are a computational vector space that mimics protein fold space and includes all simultaneously contacted residue sets, which can be used to analyze protein structure-function relation and evolution.
=== Machine Learning Force Fields === Machine Learning Force Fields (MLFFs) represent one approach to modeling interatomic interactions in molecular dynamics simulations. MLFFs can achieve accuracy close to that of ab initio methods. Once trained, MLFFs are much faster than direct quantum mechanical calculations. MLFFs address the limitations of traditional force fields by learning complex potential energy surfaces directly from high-level quantum mechanical data. Several software packages now support MLFFs, including VASP and open-source libraries like DeePMD-kit and SchNetPack.
The State Union of Serbia and Montenegro (often shortened to Serbia and Montenegro), known from 1992 to 2003 as the Federal Republic of Yugoslavia (FRY) and commonly referred to as Yugoslavia, was a country in Southeastern Europe. It was established on 27 April 1992 as a federation comprising the Republic of Serbia and the Republic of Montenegro, following the breakup of the Socialist Federal Republic of Yugoslavia (SFR Yugoslavia). In February 2003, the federation was reconstituted as a state union. Following the secession of Montenegro in June 2006, Serbia proclaimed independence. Its aspirations to be the sole legal successor state to the SFR Yugoslavia were not recognized by the United Nations, following the passing of United Nations Security Council Resolution 777, which affirmed that the Socialist Federal Republic of Yugoslavia had ceased to exist, and the Federal Republic of Yugoslavia was a new state. This made the Federal Republic ineligible to inherit the Socialist Federal Republic's international legal personality, since it had dissolved, with all former republics entitled to state succession. The government of Slobodan Milošević opposed any such claims, and as such, the FR Yugoslavia was not allowed to join the United Nations. Throughout its existence, the FR Yugoslavia had a tense relationship with the international community, as economic sanctions were issued against the state during the course of the Yugoslav Wars and Kosovo War. This also resulted in hyperinflation between 1992 and 1994.
=== Liver transplant === In people who develop acute liver failure or who are otherwise expected to die from liver failure, the mainstay of management is liver transplantation. Liver transplants are performed in specialist centers. The most commonly used criteria for liver transplant were developed by physicians at King's College Hospital in London. Patients are recommended for transplant if they have an arterial blood pH less than 7.3 after fluid resuscitation or if a patient has Grade III or IV encephalopathy, a prothrombin time greater than 100 seconds, and a serum creatinine greater than 300 mmol/L In a 24-hour period. Other forms of liver support have been used including partial liver transplants. These techniques have the advantage of supporting the patient while their own liver regenerates. Once liver function returns immunosuppressive drugs are commenced and they have to take immunosuppressive medication for the rest of their lives.
Sources: en.wikipedia.org
Several species sometimes suffer from a wasting condition caused by Vibrio bacteria. A more widespread sea star wasting disease sporadically causes mass mortalities. The results of a 2025 study of starfish off the coast of central British Columbia suggest that those living in the fjords can better survive outbreaks of the disease due to the lower temperatures and higher salinity of their environment. The protozoan Orchitophrya stellarum is known to infect and damage the gonads of starfish. Starfish are vulnerable to high temperatures. Experiments have shown that the feeding and growth rates of Pisaster ochraceus reduce greatly when their body temperatures rise above 23 °C (73 °F) and that they die when their temperature rises to 30 °C (86 °F). This species has a unique ability to absorb seawater to keep itself cool when it is exposed to sunlight by a receding tide. It also appears to rely on its arms to absorb heat, so as to protect the central disc and vital organs. Starfish and other echinoderms can be vulnerable to marine pollution. The common starfish is considered to be a bioindicator species for marine ecosystems. A 2009 study found that P. ochraceus is unlikely to be affected by ocean acidification as severely as other marine animals with calcareous skeletons. In other groups, structures made of calcium carbonate are vulnerable to dissolution when the pH is lowered. Researchers found that when P. ochraceus were exposed to 21 °C (70 °F) and 770 parts per million of carbon dioxide (beyond rises expected in the next century), they were relatively unaffected.
On 27 March the infantry and cavalry of the revolutionary army, for eight months active in Paris and surroundings, were finally disbanded, except their artillery. (Hanriot was denounced by the Revolutionary Tribunal as an accomplice of Hébert, but seems to have been protected by Robespierre.)
== Mechanism of carcinogenicity == Aflatoxin B1 is a potent genotoxic hepatocarcinogen with its exposure strongly linked to the development of hepatocellular carcinoma, liver tumors, especially given co-infection with hepatitis B virus. These effects seem to be largely mediated by mutations at guanine in codon 249 of the p53 gene, a tumor suppressing gene, and at several guanine residues in the 12th and 13th codons of the ras gene, a gene whose product controls cellular proliferation signals. Aflatoxin B1 must first be metabolized into its reactive electrophilic form, aflatoxin B1-8,9-exo-epoxide by cytochrome p450. This active form then intercalates between DNA base residues and forms adducts with guanine residues, most commonly aflatoxin B1-N7-Gua. These adducts may then rearrange or become removed from the backbone altogether, forming an apurinic site. These adducts and alterations represent lesions which, upon DNA replication, cause the insertion of a mis-matched base in the opposing strand. Up to 44% of hepatocellular carcinomas in regions with high aflatoxin exposure bear a GC → TA transversion at codon 249 of p53, a characteristic mutation seen with this toxin.
Sources: en.wikipedia.org
Cardarine is commonly known as GW501516 or GW-1516. These names refer to the same synthetic compound. It is not a brand-name approved medicine.
No, cardarine is not a steroid. It is classified as a PPARδ agonist. Its structure and receptor target differ from anabolic steroids.
No regulatory agency has approved cardarine as a medicine. It was investigated in early research but development was discontinued. It is not available as a prescription drug.
Cardarine is a common name for GW501516, a synthetic PPARδ agonist. It is not a steroid or a selective androgen receptor modulator. It was developed and studied as a research compound for metabolic pathways.